how to use solar panels to charge a 48v ?
- Thread starter willm
- Start date
dogman dan
1 PW
Should work fine.
Basicly, as long as you are getting the same voltage at fed from the panels to the battery as your charger ordinarily does, the battery won't know any difference. Don't set up so much panel the battery charges too fast for it's own good of course. Typically 5 amps of charging input is about tops for bike size packs.
The key thing about the charge controller would be that it cuts off power at the right voltage. So if your charger cuts off at 58v, then your solar should cut off at the same point, not just keep pumping in power till the battery cooks.
Too low voltage from the solar would just never get you a full charge, but wouldn't damage anything. So if the panels only put out 49v, you'd never get near a full 56v charge.
Basicly, as long as you are getting the same voltage at fed from the panels to the battery as your charger ordinarily does, the battery won't know any difference. Don't set up so much panel the battery charges too fast for it's own good of course. Typically 5 amps of charging input is about tops for bike size packs.
The key thing about the charge controller would be that it cuts off power at the right voltage. So if your charger cuts off at 58v, then your solar should cut off at the same point, not just keep pumping in power till the battery cooks.
Too low voltage from the solar would just never get you a full charge, but wouldn't damage anything. So if the panels only put out 49v, you'd never get near a full 56v charge.
migueralliart
10 kW
You can modify the shunt to draw less current althou less than 10 amps is pretty small.
slayer
1 kW
golden motor have some solar panels made for ebikes battery packs they have a 24 ...36 volts and a 48 volts 80 watts all at 345.00 set made for the lifepo4 here is their link http://www.goldenmotor.com/ scroll down on the evbattery tab
Kurt
10 kW
I just upgraded the two 40A 48v solar charge regulators on my house for one single 100A MPPT unit.
I have been experimenting with one of the old left over 40A regulators. Charging my old 48v headway 20ah battery packs. I have it hooked up to 4 x 12v 120w solar panels. Most of the good regulators like my old PL40 that have a small display and a few multy function programing buttons you can set the max charge Amps and limit it to what you like. All charging voltage is also adjustable. My regulator is a plazmatronics PL40. I set max Amps to 10A = 0.5c.
Just make sure you disable EQ charge as a lot of the regs base setting are for led acid.
Kurt
I have been experimenting with one of the old left over 40A regulators. Charging my old 48v headway 20ah battery packs. I have it hooked up to 4 x 12v 120w solar panels. Most of the good regulators like my old PL40 that have a small display and a few multy function programing buttons you can set the max charge Amps and limit it to what you like. All charging voltage is also adjustable. My regulator is a plazmatronics PL40. I set max Amps to 10A = 0.5c.
Just make sure you disable EQ charge as a lot of the regs base setting are for led acid.
Kurt
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