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Open Roads Forum  >  RVing in Mexico and South America

 > ISB Sola regulators

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Tequila

Canada - Summer, Mexico - Winter

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Posted: 05/30/21 08:16pm Link  |  Quote  |  Print  |  Notify Moderator

Some info and a question. First of all I have created a chart with the specs for the ISB Sola 4000 & 8000 compared to the Hughes 30 and 50 amp autoformers. Here it is https://www.mexicocaravans.com/ISBvsHughes.pdf

Now the question. Has anyone wired up an ISB Sola 8000? Are there separate terminals for the 2 hots in a 50 amp cable, or do you strap them together?

I do have wiring instructions for the ISB 4000 here: https://www.mexicocaravans.com/Regulator.pdf

pianotuna

Regina, SK, Canada

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Posted: 05/31/21 07:31am Link  |  Quote  |  Print  |  Notify Moderator

Tequila,

Thanks for your efforts.


I found there are three layers of boost, and one of buck. From the factory they are at 110 volts, 100 volts and 90 volts. So far I've never used more than the first 2 layers.

I love my Sola 4000. I tweaked the boost cut in voltage up to 113 which on the first layer of boost gives me 123 volts (unloaded). It cuts in fast when the air conditioner starts. I wish I had not bothered with the easy start on the roof air.

I chose to add two standard 110 volt outlets--one on the input side so I can easily monitor supply voltage. That input side allows me to use a surge suppressor in parallel before the Sola. I also added a 30 amp female plug. On the input side I hard wired a six foot cord with a male 30 amp plug.

The Sola does not "play well" with the load support feature on the Magnum inverter/charger. If I have selected that option on the Magnum remote, as soon as I add the Sola the Magnun turns on the load support.

* This post was edited 05/31/21 07:53am by pianotuna *


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

CA Traveler

The Western States

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Posted: 05/31/21 08:04am Link  |  Quote  |  Print  |  Notify Moderator

Nice comparison chart. However additional important electrical information would be useful. The ISB Sola 8000 rating of 8000va implies they have used 2 of the 4000 or 33A units. What happens when a 50A RV uses more than 33A on a leg? Is there a 33A CB or does it let the smoke out?

Does Mexico use 120/240V 50A outlets or do they have 120/240V 33A pedestals or something else?

* This post was edited 05/31/21 08:12am by CA Traveler *


2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland

Bob


CA Traveler

The Western States

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Posted: 05/31/21 08:18am Link  |  Quote  |  Print  |  Notify Moderator

Also wondering about your dimensions. The 8000 unit is only 1" higher than the 4000 unit and the Hughes 50A is smaller than the 30A unit?

CA Traveler

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Posted: 05/31/21 08:31am Link  |  Quote  |  Print  |  Notify Moderator

OK, translated the Spanish and it appears that the 8000 unit is for a single 120V circuit rated at 66A. But not sure about the specs...

pianotuna

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Posted: 05/31/21 09:09am Link  |  Quote  |  Print  |  Notify Moderator

CA Traveler,

I can't speak to the 8000, but there is no fuse or circuit breaker on the 4000, so far as I can remember.

I'm guessing 4000 is 4000 VA, which makes it an almost perfect fit for a 30 amp RV.

Tequila

Canada - Summer, Mexico - Winter

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Posted: 05/31/21 09:27am Link  |  Quote  |  Print  |  Notify Moderator

CA Traveler wrote:

Also wondering about your dimensions. The 8000 unit is only 1" higher than the 4000 unit and the Hughes 50A is smaller than the 30A unit?


Let me check on those. I will correct if I made a mistake

Tequila

Canada - Summer, Mexico - Winter

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Posted: 05/31/21 09:58am Link  |  Quote  |  Print  |  Notify Moderator

dimensions corrected

Tequila

Canada - Summer, Mexico - Winter

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Posted: 05/31/21 10:00am Link  |  Quote  |  Print  |  Notify Moderator

CA Traveler wrote:

OK, translated the Spanish and it appears that the 8000 unit is for a single 120V circuit rated at 66A. But not sure about the specs...


Yes that makes me thing it you are wiring it up with a 50 amp cord you need to bridge the 2 hots. From what I can tell that is what happens in a 50 to 30 amp convertor dog bone. I don't have one or I would check with a meter

CA Traveler

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Posted: 05/31/21 10:47am Link  |  Quote  |  Print  |  Notify Moderator

The 30A male to 50A female connector does connect both 50A hots together and that's OK since the maximum amps is 30A.

A 120V 66A connection means that the neutral can carry 66A and the RV wiring is only rated for 50A. ie For a 120/240V 50A circuit the neutral wire maximum amps is the difference of the 2 hot wires and hence a maximum of 50A. This is why all 3 wires are the same size and rated for 50A.

I suggest you remove the 8000 unit from the chart and/or make it very clear that this unit is not compatible with a 50A RV.

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