# SLA battery + MPPT use in a go kart

I'm building a hybrid PV/battery kart that is intended to weigh 120 kg with driver and average 30 km/h on a flat tarmac go kart track in full sun. I'm expecting that to require average power of 48 V x 25 A = 1200 W. Going through a corner that would mean more current, maybe max 40 A.

Please help with input about how this MPPT and SLA battery may interact as voltage and current draw change. The MPPT/PV array promises a 100 ms refresh, which I hope will be a reasonable response time as I go through a corner. If this is true and it supplies a full 5 A with a flat pedal, will the battery then supply the remaining 35 A to pull me through a corner? Then on a straight at 40 km/h, would the MPPT be supplying 5A and the battery 20 A, for example?

I plan to connect the MPPT across a 48 V series pack of 12 V 12 Ah SLA batteries. The battery in the link is supposed to handle 20 A for 10 min at a time for 200 or so cycles. 200 cycles is enough for me.

Drive rating: 48 V, 2000 W, 6.9n.m Kunray

PV panels: 4 x 60 W panels at 20 Voc, 5 A max.

• Have you tried to simulate it? Commented Feb 9, 2022 at 12:02
• Yes, had a look on falstad and multisim but I have no idea how to set up the circuit, as it would need me to customise components and the parameters are way past my level. I basically just need to know if this is worth a try or if it is totally unrealistic, don't need exact numbers. Commented Feb 9, 2022 at 12:39
• How about recalcualting the battery as a capacitor, the solar panel as a current source and your motor as a current sink? Should be easily doable in LTspice or any similar free SPICE simulator. Commented Feb 9, 2022 at 12:53