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Don't trust that junk. The solder joints inside the potted box of doom hanging off the fore end of the unit can go and allow the wimpy ring terminal protuberances to loose contact internally. Or the diodes and tiny wires go to hell - often this can result in half of the unit flip-flopping and...

I've done it enough and seen it done enough that it really wouldn't concern me. Definitely rinse it well and the final rinse could be RO water or distilled water or whatever if you like. And then apply a fast evaporating electronics cleaner and finish it off with Deoxit on all the connections...

It's done quite regularly in the vintage computer world. There really is no issue if it's done carefully and allowed to dry completely before being powered up. Plain water and soap for a few minutes isn't going to cause even a fraction of the corrosion in the short term that the last 20 years of...

If you really want it CLEAN then you remove it and wash it in soap and water with a soft brush then allow to dry in the sun. Apply Deoxit to the connections. Anything thick like dielectric grease will just trap dirt. After the cleaning inspect all the solder joints with high powered...

Flashing green on the voltage regulator is good.

There's a new versions of the disconnect relay. It's totally enclosed and much more reliable. Bussmann makes them now: https://www.ase-supply.com/Sure_Power_3106_Battery_Disconnect_p/sp-ems300-1224-d-00.htm The original one's have multiple problems. If you have the original with all the...