HELP WITH DIY BackUp Battery for 2 Mighty Jet pumps by Innovative Marine (326 GPH) Pumps

Nurse.Reef.Reapeat · Jan 18, 2021

So I am trying to DIY a battery backup for my Mighty Jet return pumps. I bought the IceCap V3 backup and it didn't work with the pump. So i am planning to make one instead. I have watched this video on youtube:

but would like more feedbacks or recommendations? plan is to get at least 24 Hours runtime.

Mighty Jet Return Pump
Watts: 15 at 100%.

McCarrick · Jan 19, 2021

Following to see how this goes. Sorry that I cannot help but I hope someone does!

Jonify · Jan 19, 2021

Sorry, what's the question? Did you get your MightyJet hooked up and working fine? Is this about the IceCap?

Nurse.Reef.Reapeat · Jan 19, 2021

Jonify said:
Sorry, what's the question? Did you get your MightyJet hooked up and working fine? Is this about the IceCap?

The Question is, is there any other options out there or suggestions on how to build a DIY Back-up. and no IceCap V3 did not work on the Mighty Jet Return. gives me an E2 error (Under Voltage Protection).

DaddyFish · Jan 19, 2021

What is the voltage and amperage draw you want to support for 24-hours?

DaddyFish · Jan 19, 2021

Looked up the pump specs. Two of them will require 37.5 amp hours at 24 vdc, assuming 80% discharge of the batteries.

That's two lawnmower batteries in series. Are you prepared for that much space, weight and cost?

Nurse.Reef.Reapeat · Jan 19, 2021

DaddyFish said:
Looked up the pump specs. Two of them will require 37.5 amp hours at 24 vdc, assuming 80% discharge of the batteries.

That's two lawnmower batteries in series. Are you prepared for that much space, weight and cost?

i think this might fit my closet. will have to measure.

McCarrick · Jan 19, 2021

Noinoi24 said:
i think this might fit my closet. will have to measure.

How are you going to charge them back up?

DaddyFish · Jan 19, 2021

FYI

I calculated using...
(15-watts x 2) @ 24 vdc = 1.25 amps/hour x 24-hours = 30 amp/hour batteries

The 35 amp/hour battery will give you some margin, but not much.

I also watched most of the video, and I honestly wasn't that impressed with it. It's too complex a setup for such a simple task.
My recommendation would be to invest in two good quality 12v trickle chargers capable of handling the continuous full-load amps, and draw your pump load directly off the two series-connected batteries. You may need to diode/rectifier isolate the 24v load to avoid feedback through the individual chargers.

Nurse.Reef.Reapeat · Jan 20, 2021

DaddyFish said:
FYI

I calculated using...
(15-watts x 2) @ 24 vdc = 1.25 amps/hour x 24-hours = 30 amp/hour batteries

The 35 amp/hour battery will give you some margin, but not much.

I also watched most of the video, and I honestly wasn't that impressed with it. It's too complex a setup for such a simple task.
My recommendation would be to invest in two good quality 12v trickle chargers capable of handling the continuous full-load amps, and draw your pump load directly off the two series-connected batteries. You may need to diode/rectifier isolate the 24v load to avoid feedback through the individual chargers.

Thank you so much for the info. I’m so bad at imagination. Would you kind enough to get us a diagram?

DaddyFish · Jan 20, 2021

Noinoi24 said:
Thank you so much for the info. I’m so bad at imagination. Would you kind enough to get us a diagram?

I can't get to circuit design software at moment, but I found this handy diagram on the Deltran Battery Tender website. It's how I recommend you setup the battery backup for your 24 vdc pumps. Just make sure the chargers are capable of at least 1.5 amps constant, 2.0+ would be better. That way the chargers can supply the normal power as long as the AC outlet is live, along with some reserve to keep the batteries fresh for outages.

Nurse.Reef.Reapeat · Jan 21, 2021

DaddyFish said:
I can't get to circuit design software at moment, but I found this handy diagram on the Deltran Battery Tender website. It's how I recommend you setup the battery backup for your 24 vdc pumps. Just make sure the chargers are capable of at least 1.5 amps constant, 2.0+ would be better. That way the chargers can supply the normal power as long as the AC outlet is live, along with some reserve to keep the batteries fresh for outages.

You’re awesome! Thank you so much.

Nurse.Reef.Reapeat · Jan 21, 2021

DaddyFish said:
I can't get to circuit design software at moment, but I found this handy diagram on the Deltran Battery Tender website. It's how I recommend you setup the battery backup for your 24 vdc pumps. Just make sure the chargers are capable of at least 1.5 amps constant, 2.0+ would be better. That way the chargers can supply the normal power as long as the AC outlet is live, along with some reserve to keep the batteries fresh for outages.

Do I need that power replay too and all that in the video?

Nurse.Reef.Reapeat · Jan 21, 2021

DaddyFish said:
I can't get to circuit design software at moment, but I found this handy diagram on the Deltran Battery Tender website. It's how I recommend you setup the battery backup for your 24 vdc pumps. Just make sure the chargers are capable of at least 1.5 amps constant, 2.0+ would be better. That way the chargers can supply the normal power as long as the AC outlet is live, along with some reserve to keep the batteries fresh for outages.

Design wise, I can just follow the video? Or you have better idea?

Nurse.Reef.Reapeat · Jan 25, 2021

Well, I was finally able to built and finish one... took me more or less 2 hours as I was trying to figure out how the wire goes and how the relay works. I thank God it’s Finally over... here’s some photos. FYI. It doesn’t look good down there. Lol.

DaddyFish · Jan 25, 2021

Function before Purdy is perfectly acceptable. You can make it purdy later.

Wherever/however you dress it up, make sure it's serviceable. You should plan on testing the backup function at least every six months. And plan on replacing those batteries every 4-5 years or earlier if they lose capacity.

I also highly recommend spraying the battery connections with a battery terminal protector spray. This is my favorite and commonly available at automotive parts stores.

When you get a chance to run a real-life current load test, it would be nice to share that info for others. And it would give you a realistic expectation of the backup time available from your setup.

sark · Mar 7, 2021

Noinoi24 said:
Well, I was finally able to built and finish one... took me more or less 2 hours as I was trying to figure out how the wire goes and how the relay works. I thank God it’s Finally over... here’s some photos. FYI. It doesn’t look good down there. Lol.