Hi:
I am installing a medium solar system on my 35 foot bus conversion motorhome.
I recently bought the following items, and am just starting the installation.
Magnum MS2012 Pure Sine Wave Inverter
Magnum Energy Mini-panel
Conergy 250P solar panels, 4 of them for 1000 watts 2 strings of 2 in series
Midnite Classic 150 MPPT controller
Surrette 6 Volt 460 ah AGM batteries times 2
Remote control and battery monitor for the inverter
Midnite combiner box small one
Most of the wire and breakers
The questions and concerns are:
I forgot to get the surge protection. It looks as though the MNSPD-300 would be the one of choice. How many do I need? I thought maybe 1 for combiner box, 1 for classic 150, 2 for mini-panel?
What do I do for grounding on unit - do I just ground all, AC and DC to the frame of the vehicle?
Thanks for any help on this.
Pierre
Not sure if it would work if the bus is NOT grounded.... that lightning likes to take the easiest path and without 'ground' there is no path to follow.
And for converse reasons you are probably at less surge risk, by not being attached to exterior wires of any length, and by having a big metal cage around you.
What i would do, in any install as well, is make all pairs of wires run close togther, a slight twist from time to time cant hurt, and keep the plus and minus, the hot and neutral, equal length in each pair. That way surges tend to cancel out.
So since it is on rubber tires and not grounded to earth, the surge risk due to lightning is fairly low. Possibly a MNSPD-300 on the shore power input to the inverter?
Shore power's another matter, nice big long ligthening antenna there, and the inverter ac inputs/outputs are considered the most vulnerable part of the inverter. But ill leave the recomended spd config for that to someone who knows.