It is up to you, the owner, to tell it the bank capacity and program for this as accurately as you possibly can. However, they have no clue about your banks physical Ah capacity or its actual state of health. Please be aware of this.Ĭoulomb or Ah counters count Ah’s very, very accurately. These devices are not plug & play and are only as smart as you make them. This is just one example where an Ah or Coulomb counter can become inaccurate in relation to the actual battery bank. You now draw 50% of 100Ah’s out of the battery, except the battery is only really 75Ah’s and you wind up at Īctually if you threw Peukert’s exponent into the mix you may actually be lower or higher depending upon the actual load at which it was drawn. Your battery, due to age and use, is now 75Ah’s. You had 100Ah programmed into the Ah counter. Inaccurate assumptions can lead to erroneous data: If your battery monitor is still programmed for a 100 Ah capacity, and you are drawing 50% of the assumed Ah capacity out of it, based on this 100Ah rating, you are really now drawing the bank to just 33% SOC. As batteries age their capacity changes, it is an ever moving target, so the 100Ah battery you bought three years ago may now only be a 75Ah battery. The biggest problem with traditional Ah or Coulomb counters is keeping them accurate with the batteries physical condition.
RV BATTERY MONITOR INSTALLATION INSTALL
When out cruising use absorption voltage.įACT: From the day you install your bank the physical Ah capacity is ever changing.
RV BATTERY MONITOR INSTALLATION MANUAL
If you have been at a dock at float voltage for multiple days then it is safe to assume you are full and a manual reset is fine. NOTE: Battery voltage should be at absorption level not a float voltage when performing a manual known-full reset. Net accepted current less than 1.5% of Ah capacity = ✓.Rule #1 for most tradittional Ah counters:ĭisable the “ auto-sync” feature and use manual “ known-full” re-sets. When not properly installed, and kept well calibrated, Ah counters can be horribly inaccurate… WHEN PROPERLY CALIBRATED – About 98% of Ah counters I come across are NOT properly calibrated/programmed. WHEN PROPERLY INSTALLED – About 90% of Ah Counters we come across are NOT properly installed & wired. When properly installed & properly calibrated they can extend the life of a battery bank. The battery monitor is a very useful tool for a boat-owner who has to survive on battery power. Purchasing recommended products from our affiliate partners.Helps keep content coming! We give you two excellent purchasing options below.īuy MHT Recommended Battery Monitors- Current Connectedīuy MHT Recommended Battery Monitors – Bay Marine Everything in this article is still relevant to the current series of BMV monitors. The 602 has been replaced by the BMV-7oo series. This article features the older Victron BMV-602.
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