10-11-2021, 10:22 AM | #1 |
Not Yet Wild
Join Date: Jun 2019
Posts: 10
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BB HSKY 48v and Renogy 500
Hi all,
Just upgrade to a Big Battery HSKY 48v and also installed the Renogy 500 battery monitor. All is working great but I noticed I have a constant 5w draw when not in use and key is off. Is that normal or do I have a leak somewhere? |
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10-11-2021, 05:18 PM | #2 | |
Gone Wild
Join Date: Jan 2013
Posts: 275
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Re: BB HSKY 48v and Renogy 500
Quote:
i have the same setup...well, almost. The 48v HSKY is up and running, but I have not installed the Renogy 500 as yet. i'll be watching.. |
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10-11-2021, 07:36 PM | #3 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: BB HSKY 48v and Renogy 500
Quote:
Don't know about the Big Battery units, but I'm assuming you have the Renogy wired outside of the BMS unit, meaning that any current draw from that will not be reflected in the Renogy's tabulations. I have a power switch that controls the voltage output from the BMS, and if I leave it "on" all the time there is about a 5% / week drain that is not reflected on the Renogy.Turning the switch "Off" when not using the cart and the drain is essentially zero (tested by letting it sit for a week or so both ways, then charging back to 100% and watch for the Renogy reaching 100% as it counts up at the same time the charger shuts off). I had a RoyPow battery before this and its SOC meter DID count the BMS power use (since it was wired into the BMS itself), but had a similar % drain if I left the battery power "on" all the time. |
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10-12-2021, 01:49 PM | #4 |
Getting Wild
Join Date: Jun 2020
Location: Charleston, SC
Posts: 110
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Re: BB HSKY 48v and Renogy 500
I have the same setup. I also have a 12v inverter and Alltrax controller wired to my power switch. EZGO TXT cart.
My meter reflects a 3-5 watt draw all the time, which I assume is the power required to power the unit itself (it is always on). I reference the resting voltage against the displayed calculated SOC % each day and have found that it seems to be consistently accurate, certainly well under the 5% weekly variance loss posted above. Unless you have the sealed charger from BigBattery, you have no way of knowing when the charge ends as the 15 amp charger fan runs constantly. Just be aware that is a "feature"... |
10-12-2021, 04:41 PM | #5 |
Gone Wild
Join Date: Jan 2013
Posts: 275
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Re: BB HSKY 48v and Renogy 500
Not intending to hijack the thread, but, if you happen to be watching the voltage display while charging, the point at which the voltage takes off rapidly from about 54.5 and climbs to 58.4 was the point at which the BMS "disconnected" the charger....(the charge ends..)
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10-13-2021, 08:47 AM | #6 |
Not Yet Wild
Join Date: Jun 2019
Posts: 10
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Re: BB HSKY 48v and Renogy 500
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10-13-2021, 08:48 AM | #7 | |
Not Yet Wild
Join Date: Jun 2019
Posts: 10
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Re: BB HSKY 48v and Renogy 500
Quote:
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10-13-2021, 08:49 AM | #8 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: BB HSKY 48v and Renogy 500
Quote:
I don't have a "Big Battery" battery, nor their charger, but it's clear to see on the Renogy meter biterope has when any charger shuts off (if you can't tell otherwise) as the charge amp-rate reaches zero. |
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10-13-2021, 09:36 AM | #9 | ||
Getting Wild
Join Date: Jun 2020
Location: Charleston, SC
Posts: 110
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Re: BB HSKY 48v and Renogy 500
Quote:
Reading it again, I think you are saying leaving the charger running is fine. I don't doubt it, but the fan is pretty loud, so I prefer to not hear it buzzing while I'm not using it. I'll prob install an outlet timer eventually and just charge in hour long increments or something instead of having to constantly unplug from the outlet between charge cycles. Quote:
You seem much more knowledgeable than me regarding these meter types. My understanding is that the Renogy meter is a shunt meter, is that correct or does another style of shunt exist that is different and would be more accurate? I believe these meters are also programed with the lithium charge profile used to reflect %. I had a lead acid profile shunt meter previously that was grossly inaccurate. Agreed, when the charger turns off the meter reflects it. Just a peeve of mine that on a standard charger you get an audible or visual queue. My RoyPow charger even blinked at different speeds to indicate 80% SOC status. The one BigBattery uses has a power LED and an always-on fan. Annoying that I have to come all the way to the cart and check my meter to determine where my charge is, esp given that the meter isn't a factory paired option and could have variances in accuracy. |
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10-13-2021, 01:11 PM | #10 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: BB HSKY 48v and Renogy 500
Quote:
There is no profile involved in these meters - that would be something the charger would employ. The voltage display on it is a real-time value and SOC isn't derived from it. The meters basically measure how much current, and for how long, and at what voltage (watt hours) is either taken out (discharged) or put in (charged via charger or cart's regen) through the shunted cable. You program how many AH your battery has into the meter, and this allows it to calculate a %. A meter like this also allows you to see if the AH rating of the battery is accurate (i.e. is the battery actually capable of delivering what the mfg. says it can), and how the actual initial AHs delivered when the pack is new hold up over time and numerous charge / discharge cycles. |
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