i have 400w panel how many 6v battery do i need that will hold a charge a long time
1528154
You will need about 300Ah worth of batteries with a 400w system asuming 50% Depth of Discharge. So if this is for a 12v system you can use 2 x 6v, 300Ah batteries in series.
1528155
If you are out west, 400 AH @12 volts would be a good match. On the East coast, or in some place cloudy like the Pacific Northwest, you might want 600AH @ 12V. Since you want to use 6 Volt batteries, Trojan T-105 would be a good choice. Either 4 of these or six of these hooked up in pairs with a MPPT controller. However if you are asking this question, you might not be smart enough to wire these properly. Get an expert to help.
2236907
I use this panel to charge a 4ah lithium iron phosphate battery w/ a charge controller to regulate voltage(14.1). I wanted an unbreakable portable panel for charging electronic devices. You could link two of these in parallel to 2 group 24 batteries but it would only be a trickle charge(<20watts). I would suggest a cheap charge controller even though it's not necessary to extend your battery life. These are nice panels but for two 85ah batteries you might aim for 50-75watts.
763248
Besides this kit you would need a tray cable that connects your controller to the battery bank. Since you would are doing 400 watts on a 40 amp MPPT we would recommend adding a 40 amp fuse in between the controller and battery.
990636
Battery in question is 100ah x12v = 1200 watt hours. This panel can provide 144 watts per hour for battery charging purpose. Rule of thumb batteries should not be drained more then 50% or maximum 80% otherwise battery life will be compromised, so we will consider 600 watts to be charged. 600 watts divide by 144 watts = 4.16 hours. Since this panel is 24 volt and your battery is 12v - MPPT charge controller is highly recommended. MPPT charge controller can accept higher voltage (24~36 volt) from the solar panel and charges a lower voltage battery (such as 12v). Morningstar SS-MPPT-15L will be a good charge controller for this setup. Battery in question is 100ah x12v = 1200 watt hours. This panel can provide 144 watts per hour for battery charging purpose. Rule of thumb batteries should not be drained more then 50% or maximum 80% otherwise battery life will be compromised, so we will consider 600 watts to be charged. 600 watts divide by 144 watts = 4.16 hours. Since this panel is 24 volt and your battery is 12v - MPPT charge controller is highly recommended. MPPT charge controller can accept higher voltage (24~36 volt) from the solar panel and charges a lower voltage battery (such as 12v). Morningstar SS-MPPT-15L will... » Read More Battery in question is 100ah x12v = 1200 watt hours. This panel can provide 144 watts per hour for battery charging purpose. Rule of thumb batteries should not be drained more then 50% or maximum 80% otherwise battery life will be compromised, so we will consider 600 watts to be charged. 600 watts divide by 144 watts = 4.16 hours. Since this panel is 24 volt and your battery is 12v - MPPT charge controller is highly recommended. MPPT charge controller can accept higher voltage (24~36 volt) from the solar panel and charges a lower voltage battery (such as 12v). Morningstar SS-MPPT-15L will be a good charge controller for this setup. « Show Less
1605298
First, I bought one to keep a deep cycle battery charged up. Second, I would not use the 160 watt panels as they would not be cost effective (you would probably need lots).Instead look at the 250-300watt panels. As to the #, it depends on how much power you consume, and how much of that you want to generate, ie, 5-10KWH per day.
1224563
i used 12 gauge from the solar panels to the controller and from the controller to the batteries i used no 6 awg i already had here The no 6 is probably overkill i wouldnt go any less than 8 from the controller to the batteries what is your battery bank at least 24v i hope
1157684
I actually have 4 of these 100W panels, with 3 VMAXtanks Vmaxsir 125 AGM deep cycle 12V 125ah rechargeable batteries. Today I ran 3 circuits in my house. One for the computer, the A/C motor on my central A/C, and my refrigerator. This configuration is exceeding my expectations!
1332096
The charge control can handle up to 7A. Your 30 watt panel puts out ~1.68A at high noon. You should be fine with one charge controller charging two or more batteries and it would require more charge time. Just make sure you hook up your batteries correctly. Personally and for convenience I would much prefer to get two charge controller with two solar panels for the two batteries so that I could avoid having to move and or reconnect the batteries. A larger solar panel can would benefit you quite a bit if you need to drawn power from the battery each night. Hope you are using deep cycle batteries. The charge control can handle up to 7A. Your 30 watt panel puts out ~1.68A at high noon. You should be fine with one charge controller charging two or more batteries and it would require more charge time. Just make sure you hook up your batteries correctly. Personally and for convenience I would much prefer to get two charge controller with two solar panels for the two batteries so that I could avoid having to move and or reconnect the batteries. A larger solar panel can would benefit you quite a bit if you need to drawn power from the battery each night. Hope you are using deep cycle... » Read More The charge control can handle up to 7A. Your 30 watt panel puts out ~1.68A at high noon. You should be fine with one charge controller charging two or more batteries and it would require more charge time. Just make sure you hook up your batteries correctly. Personally and for convenience I would much prefer to get two charge controller with two solar panels for the two batteries so that I could avoid having to move and or reconnect the batteries. A larger solar panel can would benefit you quite a bit if you need to drawn power from the battery each night. Hope you are using deep cycle batteries. « Show Less
338528
You will need a 36 volt to 12 volt reducer or you can connect the negitive of one 6 volt battery to the positive of second 6 volt battery .
1878731
I bought some extra wire but didn't need it. Just spliced in to the existing wire. I already had a 5 amp panel. It wasn't enough to keep the battery charged. So the short answer other than wire you shouldn't need anything
779402
I have 6 12 V 35AH batteries. I wish I had one more panel to charge in one 5 hr period. Here are my calculations. Assuming a 50% charge, each battery needs about 17 AH to recharge. 2 panels each put out about 8 amps. so 8 hrs X 16 amps is 128 AH. 128 / 17 is about 7. So my answer would be 7 35AH batteries.
157431
I connect to 24v batteries rather than solar panels to get max 300w out. The batteries are solar charged.
409642
If you are using 4 panels with this kit it only uses a 20 amp controller. You must be using a 24v battery bank to use up to 400 watts. Can you explain your situation a little more? We are a bit confused with what setup you have. Thank you. AW
279998
I have a 5000 watt power invertor. I have 4 solar panels on the roof to keep 4 group31 batteries charged to power the invertor. I also have a battery isolator to charge batteries from the alternator and shuts off when they are charged back up.
338531
no just use 1 12 volt battery if you have a 48 volt system or 2 6 volts if you have a 36 volt sys.
1138806
I have the 200 watt unit, which is the most you can run through a power outlet. For 400 watts, you would have to directly wire to the battery. I would use the fuse they recommend.
2232962
The capacity is 400W at 12V and 800W at 24V, so you can use one panel at 12V and up to three on 24V.Thank you for your interest.GordonGLR Industries, LLC