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Question Hybrid Offgrid Setup Questions

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Posts: 2
Topic starter
(@m0nkeyb0y)
Active Member
Joined: 2 months ago

Hello,

I have decided to set up a hybrid offgrid system of my own. I'd like to get this forum's input on how I intend to set it up and how I intend to use it.

I purchased the following equipment during the Black Friday sales that were going on:

EG4 6000XP Offgrid Inverter
EG4 Chargeverter GC
2 x 48V 100Ah 5.12kWh - Self-Heating Server Rack Lithium Batteries
Westinghouse WGen7500DFc
Future purchase: Solar Panels

I intend to use this as a hybrid grid/offgrid system. I'd like to use the 6000XP's bypass mode to power my house with the grid, but switch to battery power if the grid should go down. I have a very energy efficient house with all energy star rated and heat pump appliances. I should be able to power everything with a single 6000XP. I also have the generator, which I would connect to the Chargeverter then to the 6000XP's generator input to ensure that I am only sending "clean" power to the system.

I will eventually integrate solar panels into this system. Ultimately, I'd like to have my own microgrid that saves me money on my electric bill by using solar power first and using the grid as backup. I'd also like it to act as a backup for when the grid goes down, switching to solar/battery power in grid-down scenarios.

Does it seem like I've got the right equipment and use case intentions?

3 Replies
Posts: 26
(@brdfrd)
Eminent Member
Joined: 3 months ago

I think it all depends on the power consumption of your house. I have the 6000xp set up for our off-grid cabin with 5, 48-volt, 100h batteries. It easily run everything there--but that's only a 12k mini-split, apartment sized fridge, gas range, internet, LED light fixtures, and some security cameras. Worst case scenario, we'll use 7kWh/day, peak usage might be 1.5-2kW. I think you need to estimate your kWh usage for both peak and cumulative consumption for the day. If you've got washer, dryer, dishwasher, HVAC, etc, for a decent sized house, you might be bumping up against the limit of the 6000xp. And, your battery bank should get you through a power outage, but it might not be big enough to last through a day--all depends on your usage. 

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Ron
Posts: 70
 Ron
(@ron)
Estimable Member
Joined: 5 months ago

What do you have for HVAC, dryer, water heater, stove and oven, out buildings, well pumps. Anything else that draws a lot of power. 240V stuff?

I'm running a 2800 sqft cabin on not usually more than 4KW, but my 240V AC pumps are on grid. 

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Joel Brodeur
Posts: 307
(@joel-brodeur)
Reputable Member
Joined: 5 months ago

Complicated answer.

Could the equipment you have provide backup to a house running moderate loads for while - yes.

As others have indicated it would really depend on what your current average loads are and how long you want to be able to support those loads.

More technical answer:

1 - If you want to use the 6000XP to take power from the grid bypass and provide power to the house when grid goes down, there are certain considerations:

What is the supply amperage - the "main" breaker in your electrical panel.  The 6000XP will only handle a 50A pass through load (I think that is the max).  So, if your main break is a 50A or less, you could probably get away with it.

I don't think that in most municipalities this is an accepted solution though.

2 - Instead, what you might want to do is set up a critical loads panel-

Power comes into your main panel - then to the 6000XP - then feeds your critical loads.  When power goes out your critical loads stay running.  When power is up, the 6000XP bypasses the inverter and powers the critical loads.

This is one of the easier methods, but it does require rerouting your critical loads to another panel - electrical work.

3 - Another method is to have a transfer switch that allows you to turn off the mains power during a power outage and turn on a feed from your inverter back to your panel.  (not my favorite method as for me it involves too much remembering what breakers to flip).  This would also require an electrician and tends to be a more manual method.  There are some relatively expensive automatic transfer switches as well.  Just depends on your budget.  The photo in this post shows an example of this set up.  https://forum.eg4electronics.com/community/postid/12505/

 

Another technical point about your equipment and proposed idea.

 

Posted by: @m0nkeyb0y

I should be able to power everything with a single 6000XP. I also have the generator, which I would connect to the Chargeverter then to the 6000XP's generator input to ensure that I am only sending "clean" power to the system.

 

The chargeverter would not plug into the gen port of the 6000XP.  That port is for AC into the inverter(or a smart load out if I understand correctly).  The chargverter outputs DC.  You would connect the chargeverter to your batteries instead.

You can check out this PDF on the EG$ site to get some ideas of how to do Suggestion #2 above.

EG4 6000XP System Wiring Diagrams_v1.2

 

So, some questions for you:

A - as others have indicated - do you have a rough idea of what your power usage would be?

B - an idea of how long you would be willing to go on battery only before switching to gen power?

C - What size is your main breaker?

Hope this helps some and best of luck.

Please keep us posted with how it goes or if you have questions.

JB

 

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