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Old 07-01-2010, 09:09 PM   #1
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Posts: 470
Learned something new today about MegaTech isolator board

I had a question today about the MegaTech board which is the isolator board for chassis to house and house to chassis charging. I called up and spoke with someone there who walked me through the whole design. If he didn't do that, I would have thought I had a problem..

Turns out that chassis charging house keeps house at 12.2 volts and then house will drop out (without gene/shore power). Turns out that house charging chassis (without engine running) will also drop out at the same voltage.

The isolator relay simply closes the solenoid that is used for batt boost. It drops out at these voltages so that the solenoid is not overtaxed. This gives the battery a usable voltage but you still must use the main source of charging, (house--gen/shore) Chassis from engine alternator to get up above 13 volts. I also have a PDF about the design.

Thank you MegaTech for the education and for saving me grief and not chasing a problem. I may change this over to a true BIRD in the future, but since we use both systems and things are status quo, I am letting this be for now.

For long periods of storage, I use a trickle charge on chassis batteries or I turn them off. Because of the dogs we do run the gene and turn on front AC so that takes care of everything.
Stuart and Stella Denning
2016 Entegra Aspire 42RBQ
3 Bullies and a Diesel Pusher
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Old 07-08-2010, 07:17 PM   #2
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Thanks for the information Stuart keeping our chassis batteries is alway a chore.
Found this link about what you posted if its correct we will leave it.
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans
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Old 07-08-2010, 08:42 PM   #3
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That is the unit exactly..note it states it only keeps the other set at 12v until primary charging source is used. I also have a PDF of the guide of the unit itself with testing instructions. This unit uses your batt boost solenoid as the bridge and will close that if needed to bridge in the batteries.
Stuart and Stella Denning
2016 Entegra Aspire 42RBQ
3 Bullies and a Diesel Pusher
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