I am giving up on the idea of the 56V Home Depot EGO batteries and I am sort of homing in on this plan:
Manta II 10 hp DC electric motor 12 24 48 Etek / Motenergy Permanent Magnet
And to power it, using a 48V Module from a used Chevy Bolt. I know that I will need a contactor, and a large fuse, some safety disconnects, and the like. A couple questions about the lithium battery though:
What is the simplest way to charge it ? I will have days of time to recharge it, so speed is not a big issue. I am guessing that a BMS would help maintain the life of the battery, but I also am guessing that if I had none, it would probably still be fine, as long as the charger was at least a little sophisticated.
Also, I imagine that with the 4hp motor, it may draw 100 amps (and maybe up to 300 per the motor) but unlikely. At that rate, I would think that the battery will need no cooling and should last a very long time. I would mow for maybe an hour or so, max, each week.
Also, if this battery would be very oversized, is it worth investigating any NiMH options (like from a prius) or would any vehicles besides the Volt yield a 48V battery that might be lighter and smaller, and obviously less cap[acity, but maybe still enough.
Piotrsko, I have read a bunch of your Chevy Volt battery stuff. Complicated, but very interesting.